The legendary Amercian publication Sports Illustrated has our Chrissie ranked 10th in the top 25 "Tougest Athletes".
http://sportsillustrated.cnn.com/2008/extramustard/03/28/25.toughest.athletes/index.html
Interestingly they put Tiger Woods in at No1. I guess it depends on your definition of tough. I accept that mental toughness is something that Wood's has in spades.
Given the success Chrissie has had from such a standing start I've got equal amounts of respect for her too. Everything she does is given 100% effort. Hat's off.
She's also the only girl who has made me suffer in the hills :o)